Centrifugal machine.



PATENTED SEPT. 4, 1906.

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APPLICATION FILED AUG.11,1905.

" ITED STATES PATENT orrion.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed August 11, 1905'. Serial No. 273,754.

To all. w/wm it may concern:

Be it known that I, ALFRED HOFFBAUER, a citizen of the United States,residing at the city of New York, in the borough of Brooklyn and Stateof New York, have invented certain new and useful Improvements inBackingieves for ,Centrifugal Machines, of which the following is afull, clear, and exact description.

The object of my invention is to provide a backingesieve for centrifugalmachines which is incapable of lateral or vertical contraction under anyconditions, and therefore serves to provide a lirm and unyieldingsupport for the inner perforated lining no matter to what degree ofcentrifugal force the same may be subjected.

Other objects and advantages of the invention will hereinafter appear,and the novel features thereof will be set forth in the claims.

ln the drawings forming part of this speciiication, Figure 1 is avertical sectional view of a portion of a centrifugal machine, showingmy improved backing-sieve applied thereto. Fig. 2 is a horizontalsection of the same, and Fig. 3 is a detail perspective view of aportion of the backing-sieve.'

liike reference-numerals indicate like parts in the different views.

` The rotary drum .,1 is provided with the cylindrical walls 2, havingrather coarse perforations 3 therein, and withthe usual lining4 oflinely-perforated sheet metal. All these parts are old and well knownand so far as my present invention is concerned may be of any suitableform and construction. Interposed between the cylindrical walls 2 of thedrum and the perforated lining 4 is my improved backing-sieve 5. Thisconsists of an elongated strip of vertically crimped or corrugated sheetmetal having perforations 6 therein. 'lhe same has its ends overlapping,with the crimped portion of one end fitting within 'the crimped portionof the adjacent end, as shown in Fig. 2 of the drawings. It extends fromthe bottom of the drum 1 up to the top thereof and thus forms a firmsupport for the inner lining 4 at all points.

By reason of the fact that the crimped or corrugated portion of one ofthe overlapping responding portions of the adjacent end the two ends ofsaid sieve are in a measure interlocked one with the other and thetendency of the sieve to longitudinally expand or elongate at this pointis reduced to a minimum. In order that such elongation or longitudinalexpansion may take place, it is necessary for one of the freeoverlappping ends of the backing-sieve to move inwardly toward thecenter or axis of the drum. This action is of course very stronglyresisted by the centrifugal force acting outwardly from the axis. As aresult the backing-sieve is practically held against separation at itsends.

The vertical corrugations 7 in the backingsieve provide for theseparation of the lining 4 from the inner surfaces of the walls 2, sothat there is no obstruction to the passage of the liquid through theperforations 3. These corrugations also permit of the longitudinalexpansion of the backing-sieve, due to the action of centrifugal force,when the drum 1 attains a high rate of speed; but although thisexpansion or elongation is permitted it is absolutely impossib e for anylateral or vertical vcontraction of the sieve 5 to take place.

Consequently under all conditions the ining 4 is provided with acontinuous backing or support at all points. No bending of this liningalong its upper and lower edge-scan take place, as is common with theold form of acking-sieve, and consequently the action of Vthedeviee as awhole is just as satisfactory at one time as it is at another.Furthermore, by reason of the fact that the backing-sieve is made from astrip of sheet metal it is much more substantial and durable than theold form of backing-sieve.

Having now described my invention, what I claim is- 1. The combinationwith the perforated c lindrical walls of a centrifu al machine and t eperforated lining thereof, of a backingsieve of vertically-crimpedperforated sheet metal interposed between said lining and said walls,the said sieve being in contact with, and serving to )revent contactbetween, said walls and said 2. The combination with the perforatedcylindrical walls of a centriu al machine and In witness whereof Isubscribe my signature the perfforated llilning thero Ioff. abscklilngin the presence of two Witnesses.

sieve o vertica y-crirn e e crate s eet metal interposed betwgen Saidlining and ALFRED HOFFBAUER said walls, the ends of said sieve beingfree Witnesses: and the crimped portion of one end fitting WM. M.STOCKBRIDGE, within the corresponding portion of the other. FRANK S.OBER.

